For more than a century electric networks have evolved on the basis of a three phase symmetrical equilibrium system. If the current and voltage distortion is seen as inevitable in the daily exploitation, the philosophy basically remains the same: the three phases are considered as a single symmetric ensemble. In high, very high and ultra high voltage (HV, VHV, and UHV) the appearance of a continge...
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This paper presents a scheme for predicting and modelling of nonstationary signals possessing fractal characteristics, using a resource-allocating network (RAN). One significant feature of a RAN is its ability to allocate resources corresponding to the complexity of nonstationary signals, thus tracking and matching the complexity of nonstationary signals can be achieved. The experimental results o...
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We discuss a multimedia interactive courseware rendering system developed at the Multimedia Information and Mobile Agent Research Lab, University of Ottawa. This system, which exploits the latest information technology such as Java applets, servlets, etc., provides a platform-independent learning environment. An interaction mechanism is also exploited to allow active participants in the learning p...
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This paper outlines a procedure which uses a power system description language to train a neural network to generate conditional probabilities for device failures. The proposed method minimizes the need for the use of explicit conditional statements
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At the Multimedia Information and Mobile Agent Research Lab. At the University of Ottawa, we have designed and developed a multimedia interactive telelearning system (MITS). It is entirely based on the object-oriented paradigm, new trends in multimedia computing and the utilization of advanced technologies. It aims at providing students with a seamless environment for facilitating education proces...
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This paper deals mainly with the real-time implementation of an observer-based fault detection and isolation (FDI) scheme on a laboratory scale electric power system to detect various faults in the synchronous generator excitation control loop. The following types of faults have been considered: sensor faults, and load faults in the synchronous machines. The paper has concluded that for the purpos...
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This paper reports work on the development of a feedback system model for prototyping an air traffic control trainer (tATC). The feedback system itself represents a cleanroom engineering process designed as a closed loop containing decider, effector, and measure processes with reference values taken from a cleanroom plan and software engineering guide. The project-specific and atomic (task specifi...
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This paper describes project Springfield, a real-time distributed simulation of a mobile telecommunications network. Springfield permits real-time viewing and modification of the simulation and its parameters, which is ideal for capacity planning and performance modeling. An object-oriented, distributed simulator was implemented in Java and speedups of up to three times were obtained
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This paper presents a model of filtering agents for the search of information from heterogeneous sources. This model deals in particular with user requests and with source requests in the process of information filtering. Typically, a task of filtering is subdivided into sub-tasks, which are then executed by different agents; each endowed with a specific expertise. These agents are thus integrated...
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A composite classification scheme is proposed by combining several classifiers with distinctly different design methodologies. The classifiers are selected from a number of state of the art pattern classification schemes with a view to obtain superior performance. In this scheme, no a priori information except a set of pre-classified data is assumed to be available. By using distinctly different c...
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The push towards deregulation in the electric utility industry is forcing a revaluation of the way transmission systems are operated. Reliance on the natural flow of current cannot meet the new requirements imposed by deregulation. One method to dictate the power flows is the increased reliance of Flexible AC Transmission Systems (FACTS). This paper presents some of the new directions being invest...
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This paper deals with a DSP based implementation of a new control method of a 3-phase active filter (AF) to compensate harmonics and reactive power of nonlinear loads. A current controlled voltage source inverter (CC-VSI) based configuration is used as the AF and PWM current control technique is used to derive gating signals to the devices of the AF. A 3-phase diode bridge rectifier with resistive...
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We show that it is possible to generate, using an l-stage shift register, a pseudo-random binary sequence longer than (2l-1), that is longer than the so-called maximal length sequence. This can be done by subdividing the l-stage shift register into two parts and clocking each part at different speeds. An example is presented to show some results
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The paper presents a simple PWM power filter for single phase motorized inrush-current loads such as air conditioning, ventilation and water pumping. The paper presents the simulation results and prototype laboratory testing and validation of the smart modulated passive filter using a dynamic RMS-current tracking controller. The smart filter/energy miser ensures supply power quality enhancement, l...
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Under deregulation, the electricity market will generate numerous bilateral transactions between the buying and selling entities. In this paper, all bilateral transactions are treated as a form of interconnections so that the classical methodology can be applied to study the feasibility of any proposed transaction on the basis of system security and the existence of other simultaneous bilateral tr...
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An algorithm to recognize facial expression using a fuzzy expert system is presented. Computer simulation using 39 expressive facial images shows more than an 86.7% accuracy. From the experimental results, the prospects of using this method are very encouraging
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A technique for tracking the time-varying minimum of a time-dependent function is proposed. It ensures the tracking process converge exponentially. It also enables the tracking to move from the minimum at one instant of time to the minimum at the next instant of time, without any error. Examples are given to show that this technique is effective for tracking the time-varying minimum. Application o...
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This paper gives the analysis and design by state plane method of a current source inverter with induction motor. The basic operation of an auto-sequentially commutated current-source inverter (ASCI) connected to an induction motor load is detailed elsewhere and will not be repeated here. Each 60° period of the inverter operation with noovelap consists of three successive modes, viz charging, ...
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This paper introduces an approximate reasoning system for assessing software quality and introduces the application of two computational intelligence methods in designing a software quality decision system, namely, granulation from fuzzy sets and rule-derivation from rough sets. This research is part of a computational intelligent systems approach to software quality evaluation, which includes a f...
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The paper presents the wavelet analysis as a new tool for studying transients typically encountered in power systems. Simulated and measured signals are analyzed. The results show that the wavelet transform can be efficient and useful for analysis and understanding of some power system transient phenomena
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The concept of topology of distributed communication networks constitutes a most complex problem of which the solution depends largely on the routing algorithm utilised. The latter has to be robust enough for avoiding network congestion and minimising the delay of messages. This article proposes a routing algorithm called MINDEL and determines the destination of flows in conjunction with distribut...
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In the increasingly competitive electric industry there's a need to carry out an optimal management of the interconnected systems. This paper deals with a computational comparison of two different approaches to solve a multi-area optimal power flow (MOPF) problem. The first approach considers all the interconnected sub-systems as a single system; the optimal operating strategy that is obtained is ...
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The author starts with the university NSERC research he carried out in the 1970s and 1980s in the Electrical and Computer Engineering Department of the University of Waterloo. The NSERC and industrially funded research encompassed both fundamental and applied contributions in the field of semiconductor devices and integrated circuits. The author then describes the process by which he created the D...
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